Page 78 - CITS - Welder - Trade Theory

WELDER - CITS

5 Water

6 Baffle plate
7 Purifying materials
8 Filter wool
9 Wire screen10 Bursting disc
11 Pressure gauge
12 Gas controlling tap

Fig 1

Working principle in normal stage: The acetylene gas from the carbide to water acetylene generator enters
through the inlet connection of the flash back arrestor and goes to water compartment through non, return space
valve and baffle plate, filter wool. Baffle plate reduces the velocity of acetylene gas whereas the purifying materials
purify the generated acetylene gas that goes to outlet through the regulator and gas controlling tap.
Accidental Condition: Flash back from the blow pipe enters through the outlet connection in flashback arrestor
and goes to the non-return valve through the filter wool, baffle plate and water. Flash back creates the pressure
and pushes the water down wards when the ball of non-return valve comes down and closes the inlet acetylene
gas with the help of the disc. With the result, no more gas enters inside the flash back arrestor.The acetylene gas
which is already in the flask back arrest or burns due to this pressure, the bursting

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CITS : C G & M - Welder - Lesson 14-26 CITS : C G & M - Welder - Lesson 14-26